Here is the full list of all 32 Blocks That Matter achievements.
Watch the credits until the end
Free Alexey and Markus
Collect 10 Blocks That Matter
Upgrade Tetrobot so he can drill crystal blocks
Die by kissing a slime
Avoid the death of the fire slime in "Collateral damage"
Upgrade Tetrobot so he can drill metal blocks
Draw all possible tetrominoes shapes in puzzle mode
Collect your very first Blocks That Matter
Upgrade Tetrobot so he can destroy lines
Squash a slime with a falling block
Experience the effect of the nanoreset explosion
Collect 20 Blocks That Matter
Collect 40 Blocks That Matter
Collect 10 Stars
Collect 20 Stars
Collect 40 Stars
Collect a Green Star
Complete "The Underground Rescue" with 100%
Complete 10 Bonus Levels
Complete "The Invader" without having burned a wood block
Complete "An Ice Glitch" saving 4 blocks of sand
Play a community level and rate it
Playtest a level you’ve created with the ingame level editor
Destroy 4 lines of 8 blocks at the same time in "Manual Tetris"
Collect the 3 BTMs that inspired this game
Collect 3 BTMs made by french developers
Join the Blocks That Matter Steam group
Perform the longest possible fall in the game
Start and finish "The Underground Rescue" in a single game session
Complete 20 Bonus Levels
Complete all the Chocolate Update levels